(2целых 5/6 + 1целое 7/9) умножить на 3целых 3/5 + (2целых 5/6 - 1целая 7/9) умножить на (-2целая 16/19)

(2 5/6+1 7/9) * 3 3/5 + (2 5/6-1 7/9) * (-2 16/19) = 16 4/15

2 5/6+1 7/9 = 17/6+16/9 = (51+32)/18 = 83/18

2 5/6-1 7/9 = 17/6-16/9 = (51-32)/18 = 19/18

83/18*3 3/5 = 83/18*18/5 = 83/5

19/18*(-2 16/19) = 19/18*(-54/19) = -1/3

83/5+(-1/3) = 83/5-1/3 = (249-5)/15 = 244/15 = 16 4/15